An insecticidal component, 1B-4 was isolated from the acetone extract of the mycelium of IB strain by bioassay-guided. The molecule structure of 1B-4 was determined by IR and NMR as a kind of fatty acid.

• 在活性追踪指引下，采用Pre-TLC技术，从IB菌株菌丝体的丙酮粗提物中分离到1个杀虫活性物质1B-4，采用红外光谱和核磁共振波谱技术初步鉴定为一类羟基取代的长链脂肪酸类化合物，可能为两个异构体的混合物。